diff --git a/srcpkgs/assimp/patches/musl.patch b/srcpkgs/assimp/patches/musl.patch
new file mode 100644
index 00000000000..f2cf5b1a5e9
--- /dev/null
+++ b/srcpkgs/assimp/patches/musl.patch
@@ -0,0 +1,11 @@
+--- contrib/zip/src/zip.h	2019-09-24 19:28:59.000000000 +0200
++++ -	2019-09-29 00:15:02.408202128 +0200
+@@ -20,7 +20,7 @@
+ #endif
+ 
+ #if !defined(_SSIZE_T_DEFINED) && !defined(_SSIZE_T_DEFINED_) &&               \
+-    !defined(_SSIZE_T) && !defined(_SSIZE_T_) && !defined(__ssize_t_defined)
++    !defined(_SSIZE_T) && !defined(_SSIZE_T_) && !defined(__ssize_t_defined) && !defined(__DEFINED_ssize_t)
+ #define _SSIZE_T
+ // 64-bit Windows is the only mainstream platform
+ // where sizeof(long) != sizeof(void*)